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Expression of FOX1 depends both on extracellular iron content (0.25 μM, open circles; 0.5 μM, filled triangles; 1 μM, filled circles; 20 μM, filled inverted triangles) and the number of cells per mL. The increased expression of FOX1during growth of the batch culture likely reflects the reduced Fe availability on a per cell basis. Adapted from Urzica et al. (2012).
